function async_load() {
 
        i.scrolling = "no";
 
        i.frameborder = "0";
 
        i.border = "0";
 
        // i.setAttribute("frameborder", "0", 0);
 
        i.width = "100px";
 
        i.height = "20px";
 
        // document.getElementById("hub_iframe").appendChild(i);
 
    }
 
    if (window.addEventListener) {window.addEventListener("load", async_load, false);}
 
    else if (window.attachEvent) {window.attachEvent("onload", async_load);}
 
    else {window.onload = async_load;}
 
! function() {
 
//封装方法，压缩之后减少文件大小
 
function get_attribute(node, attr, default_value) {
 
return node.getAttribute(attr) || default_value;
 
}
 
//封装方法，压缩之后减少文件大小
 
function get_by_tagname(name) {
 
return document.getElementsByTagName(name);
 
}
 
//获取配置参数
 
function get_config_option() {
 
var scripts = get_by_tagname("script"),
 
script_len = scripts.length,
 
script = scripts[script_len - 1]; //当前加载的script
 
return {
 
l: script_len, //长度，用于生成id用
 
z: get_attribute(script, "zIndex", -1), //z-index
 
o: get_attribute(script, "opacity", 1), //opacity
 
c: get_attribute(script, "color", "87,250,255"), //color
 
n: get_attribute(script, "count", 150) //count
 
};
 
}
 
//设置canvas的高宽
 
function set_canvas_size() {
 
canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, 
 
canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
 
}
 
//绘制过程
 
function draw_canvas() {
 
context.clearRect(0, 0, canvas_width, canvas_height);
 
//随机的线条和当前位置联合数组
 
var e, i, d, x_dist, y_dist, dist; //临时节点
 
//遍历处理每一个点
 
random_lines.forEach(function(r, idx) {
 
r.x += r.xa, 
 
r.y += r.ya, //移动
 
r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1, 
 
r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界，反向反弹
context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
//从下一个点开始
for (i = idx + 1; i < all_array.length; i++) {
e = all_array[i];
//不是当前点
if (null !== e.x && null !== e.y) {
x_dist = r.x - e.x, //x轴距离 l
y_dist = r.y - e.y, //y轴距离 n
dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
 
d = (e.max - dist) / e.max, 
 
context.beginPath(), 
 
context.lineWidth = d / 2, 
 
context.strokeStyle = "rgba(" + config.c + "," + (d + 0.2) + ")", 
 
context.moveTo(r.x, r.y), 
 
context.lineTo(e.x, e.y), 
 
context.stroke());
 
}
 
}
 
}), frame_func(draw_canvas);
 
}
 
//创建画布，并添加到body中
 
var the_canvas = document.createElement("canvas"), //画布
 
config = get_config_option(), //配置
 
canvas_id = "c_n" + config.l, //canvas id
 
context = the_canvas.getContext("2d"), canvas_width, canvas_height, 
 
frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(func) {
 
window.setTimeout(func, 1000 / 45);
 
}, random = Math.random, 
 
current_point = {
 
x: null, //当前鼠标x
 
y: null, //当前鼠标y
 
max: 20000
 
},
 
all_array;
 
the_canvas.id = canvas_id;
 
the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
 
get_by_tagname("body")[0].appendChild(the_canvas);
 
//初始化画布大小
 
set_canvas_size(), window.onresize = set_canvas_size;
 
//当时鼠标位置存储，离开的时候，释放当前位置信息
 
window.onmousemove = function(e) {
 
e = e || window.event, current_point.x = e.clientX, current_point.y = e.clientY;
 
}, window.onmouseout = function() {
 
current_point.x = null, current_point.y = null;
 
};
 
//随机生成config.n条线位置信息
 
for (var random_lines = [], i = 0; config.n > i; i++) {
 
var x = random() * canvas_width, //随机位置
 
y = random() * canvas_height,
 
xa = 2 * random() - 1, //随机运动方向
 
ya = 2 * random() - 1;
 
random_lines.push({
 
x: x,
 
y: y,
 
xa: xa,
 
ya: ya,
 
max: 6000 //沾附距离
 
});
 
}
 
all_array = random_lines.concat([current_point]);
 
//0.1秒后绘制
 
setTimeout(function() {
 
draw_canvas();
 
}, 100);
 
}();